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A006730
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Series for second perpendicular moment of square lattice (eventually changes sign).
(Formerly M1841)
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2
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0, 2, 8, 24, 64, 156, 358, 786, 1664, 3434, 6902, 13656, 26464, 50772, 95754, 179442, 331294, 609496, 1106106, 2004852, 3586874, 6423028, 11351274, 20126538, 35191190, 61883196, 107179834, 187216848, 321395596, 558468104
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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REFERENCES
| J. W. Essam, A. J. Guttmann and K. De'Bell, On two-dimensional directed percolation, J. Phys. A 21 (1988), 3815-3832.
Jensen, Iwan; Guttmann, Anthony J.; Series expansions of the percolation probability for directed square and honeycomb lattices. J. Phys. A 28 (1995), no. 17, 4813-4833.
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
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LINKS
| I. Jensen, Table of n, a(n) for n = 0..171 (from link below)
I. Jensen, More terms
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CROSSREFS
| Cf. A006461, A006727, A006728, A006729.
Sequence in context: A006728 A075216 A127790 * A131135 A097064 A134401
Adjacent sequences: A006727 A006728 A006729 * A006731 A006732 A006733
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Simon Plouffe (simon.plouffe(AT)gmail.com)
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EXTENSIONS
| The first negative term is the 66th.
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